https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105210
--- Comment #2 from David Binderman <dcb314 at hotmail dot com> ---
It seems that recent gcc trunk can't detect set-but-not-used in this code:
extern int g( int);
void f( int m)
{
int n;
n = 0;
for (int i = 0; i < m; ++i)
{
if (g( i))
{
++n;
}
}
}
$ /home/dcb/gcc/results/bin/g++ -c -g -O2 -Wall -Wextra -pedantic apr10b.cc
$
Recent clang trunk can:
$ /home/dcb/llvm/results/bin/clang++ -c -g -O2 -Wall apr10b.cc
apr10b.cc:8:6: warning: variable 'n' set but not used
[-Wunused-but-set-variable]
int n;
^
1 warning generated.
$
